My Math Forum square senteces three formulas one task

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 May 8th, 2015, 01:43 PM #1 Member   Joined: Jan 2015 From: Norway Posts: 95 Thanks: 1 square senteces three formulas one task Task 1.18 F) (r-5s)^2 + 7(2x-3r)^2 - (r-5s)(2s-3r)= 67r^2 - 111rs + 63s^2. I get confused of the letters and i get bad answers when i try to solve the task.
May 9th, 2015, 01:27 PM   #2
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 Originally Posted by Zman15 Task 1.18 F) (r-5s)^2 + 7(2x-3r)^2 - (r-5s)(2s-3r)= 67r^2 - 111rs + 63s^2. I get confused of the letters and i get bad answers when i try to solve the task.
You appear to have a typo (x should be s). Could you show your work. The expression is correct.

May 9th, 2015, 05:23 PM   #3
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Quote:
 Originally Posted by Zman15 (r-5s)^2 + 7(2s-3r)^2 - (r-5s)(2s-3r) = 67r^2 - 111rs + 63s^2. I get confused of the letters and i get bad answers when i try to solve the task.
It's all simple squaring and multiplication:
handle it properly and you'll end up with 67r^2 - 111rs + 63s^2 as shown.
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